(github/ci) add basic CI that attempts to build harness

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  # pull_request: {}
+
+# cancel in-progress job when a new push is performed
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        # version: [4.12.0, 4.14.1]
+        version: [4.14.1]
+
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: System dependencies (ubuntu)
+      run: |
+        sudo apt install build-essential gcc-aarch64-linux-gnu qemu-system-aarch64
+
+    - name: Build harness
+      timeout-minutes: 5
+      run: |
+        make build